B-Modifieds

Rules are based on 2015 Lucas Oil Modified Rules, but exceptions do apply at our track to engines, heads, tires, shocks, and final drive ratio. Please check these rules carefully for deviations from standard Lucas rules.

All cars in competition must have a complete paint job, no reflective doors or quarter panels.

Body must be the same width, front to rear, and parallel to the frame.

Wickers (air-flow): 1” tall on the nose and roof only. No wicker on top of any type of body roll. (Like a 5 star nose).

Roof Rake: 4.5 ” max, highest Point to 2” back of front windshield. Must be a full size roof. No wings.

Rear Spoiler/Allowed 4” tall, top 3” clear plastic cannot be wider than rear body. 240 square inches max. 3 inches tall spoilers can be over 60 inches wide, but not wider than the rear body or over 240 sq. inches. We do not want any end cap support going forward. You can have a support in the center going forward, but it must be 12 inches from the end cap and cannot be longer than 10 inches and must taper down from the top of the spoiler to zero.

Engine compartment will remain open, no side panels; hood sides may have maximum five-inch drop and must be enclosed at rear of hood; maximum hood scoop height – six inches. Passenger side of body must be no further forward than rear of block. Rear of bodies to be solid panel at least eight inches high.

No panel in front of right door to engine compartment. No inner panels.

Engine must be enclosed from driver, (hot water, oil and fire) full windshield, or back of hood blocked off will be allowed. No open holes between motor and driver.

Mirrors are allowed.

Sail panels must closely resemble examples shown on body diagram and be the same on both sides of car. Reinforcing lips on rear of sail panels must be 180 degree bends.

Rear quarter panels cannot be over 2 inches difference left to right.

No inner fender well

The body may not go past the rear bumper. The front nose may go past the front bumper three inches.

Doors: you can have a two inch step in the door panel (body line) no higher than the center line of the wheel base. (center of front hub or rear axle)

Body not conforming to the spirt of the rules – IS A FIX OR GO HOME RULE.

FRAMES AND WEIGHT

Ground Clearance 3 1/2” Frame, 3” Oil Pan with driver. No part of race car can be lower than 3 inches from the ground (the head of the bolt will be allowed). Weight//2500 lbs., 58% Left Side with Driver before race.

All cars must weigh prior to the race with driver and helmet – all safety equipment in lap and hands on steering wheel. At that time all cars shall weigh no less than 2,500 pounds and no more than 58% left side weight.

American passenger car frames only. Frames may be cut in rear only at point not further than 36 inches from center of rear end housing. No front clips or tube type allowed. Maximum two inch wide by four inch tall frame stiffener may be welded directly to outside of frame rail. No uni-body type front stub. Front stub must have stock side rails, same make as stub.

Frames may not be widened or narrowed and must be able to support roll cage on both sides. Must be full and complete both sides. Front crossmember must remain full and intact; center of crossmember may be notched and boxed for radiator and/or steering clearance only.

Minimum wheelbase, 108 inches, both sides. Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire to outside of tire. Front tire width will be measured at the top of the tire sidewall with driver in car. (78 1/16 of an inch, will NOT race.)

SUSPENSION AND STEERING

After market steel front hubs are allowed.

Suspension, steering: After market OEM copies with hole location changed are approved, STEEL ONLY, and rear end suspension must be steel. Steering box must be steel approved OEM and must remain within original bolt pattern for type of frame used. No rack & pinion allowed. Steel steering shafts and knuckles only. In-cockpit steering may be modified to suit driver’s taste, but must be kept on left side of cockpit. No center steering allowed. Steering columns must be collapsible (U-joints are acceptable).

Shocks: Only shocks allowed are one mono-tube steel, nonadjustable, unaltered shock per wheel. No threaded body shocks, front or rear, or air type, or remote reservoir shocks. Schrader valves allowed. Shocks cannot be mounted in center of spring.

No devices allowed that would enable driver adjustment to alter wheelbase or for weight jacking while car is in competition. No air shocks or air bags allowed.

Springs: Only springs allowed are one steel, non-progressive coil spring and/or steel leaf spring per wheel. All coil springs must be at least 4.5 inches O.D. No torsion bars or air bags.

Rear Suspension: No independent rear suspension. All components must be steel. No covers allowed. All trailing arms/link bars must be steel tubing. Rear of frame may be altered to accept leaf or coil springs. Steel coil-over eliminators. Minimum 19-inch long panhard bar, measured center to center. No cambered rear end housings. One mechanical traction bar, Rubber bumpers allowed.

Rear of engine (bellhousing flange) is mounted at least 72 inches forward from the center line of rear axle. Engine offset must be kept within two inches of centerline of front crossmember with engine level. 10 1/2 inch engine height minimum from ground to front center of crankshaft.

Cooling system may be modified. Any overflow tubes must be directed to the ground between frame rails. Radiators to be mounted in front of engine only.

Conventional air cleaner housings only. No top flow air cleaner housings allowed. K&N Performance Air Filters are allowed.

ENGINE EXHAUST SYSTEM

Exhaust system must be mounted in such a way as to direct spent gasses away from cockpit of vehicle and away from areas of possible fuel spillage.

All exhaust must go through a muffler. 92 DBA’s at 100 feet. One large muffler is allowed.

Mufflers must be welded or bolted. Just clamped will not be allowed.

DRIVE TRAIN

TRANSMISSION/DRIVESHAFT: Must have at least one forward gear and one reverse, plus a neutral position. With engine running and car in still position, must be able to engage car in gear and move forward, then backward. OEM production type or Lucas Oil approved aftermarket transmissions allowed – two-speed, three-speed, four-speed and automatic. No five speed transmissions, ‘in and out’ boxes, or quick change devices are not allowed. Functioning shift levers must be in OEM location on all OEM production type transmissions. All belt drive pumps must be mounted on front of engine. Flexplates must be full, steel, unaltered OEM, or OEM replacement. Flywheel/flexplate must bolt to engine between clutch assembly and crankshaft and all driveline components within bellhousing must rotate while car is in any gear. Transmission must be one of the following designs:

OEM Manual: Must have a standard OEM case and working disc-type clutch or approved cone or disc-type coupler inside an explosion-proof steel or aluminum bellhousing. Aluminum bellhousing and reverse mounted starter allowed. One flywheel only, minimum 8.5 inch diameter. Diameter of clutch disc must be a minimum of 5.5 inches. Clutch assembly must be steel, except housing, which must be steel and/or aluminum. Bellhousing can have only a hole for throwout bearing lever or hose must be 270 degrees around top of clutch and flywheel area. Standard or reverse mount starter allowed, must directly engage flywheel. Stock OEM flywheel with stock bellhousing must have scatter shield.

Automatic: Must remain in OEM or OEM replacement case, with a functioning OEM appearing pump. Aluminum OEM bellhousing may be replaced with aftermarket explosion-proof aluminum bellhousing. Original OEM bellhousing must have approved scattershield constructed of minimum .125- inch by threeinch steel, 270 degrees around flexplate.

Aftermarket Manual: Must be Lucas Oil approved, aluminum case, with internal clutch. Must bolt to explosion-proof steel bellhousing, and use full, steel, unaltered OEM or OEM replacement flexplate with starter mounted in OEM location. No coatings or paint allowed on transmission case.

Drive Shaft: Minimum two inch diameter steel drive shaft and must be painted white. Steel slip-yokes only. 360-degree drive shaft loop required and must be constructed of at least .125 inch by two inch steel, or one inch tubing, mounted six inches back from front U-joint.

REAR END

Maximum final drive ratio is 5.43. Any approved OEM passenger car type or truck rear end may be used.

No aluminum allowed, except lowering blocks, axle cap, and drive flange. A one-inch inspection hole in center section is recommended. Full steel spool, steel mini spool or welded rear ends only. No open or unlocked rear ends, steel axles only. We will pull rear end out and look for aluminum this season.

Must have a working caliper and rotor on each wheel and must lock up all four wheels.

Brake shut-off or pressure sensitive devices allowed.

One proportioning device allowed, front to rear only.

Brake lines must be outside frame rails and visible.

Vented rotors only, no scalloped rotors. Rotors cannot be lightened. Rotors may be re-drilled for different bolt pattern or larger studs. Must be steel, approved OEM calipers, and they cannot be lightened.

TIRES AND WHEELS

Track tire is Hoosier 970. No soaking or altering the compound of the tire in any way.

Wheel must be a Lucas Oil approved wheel prior to use as a bead lock wheel. External, steel bead lock only and it cannot make the wheel any narrower than 8 inches and no wider than 8.75 inches. Measured at the outside of wheel bead. Must use only steel bolts. Rim-mounted bleeder valves are not allowed.

Must qualify and race on the same tires and wheels.

ELECTRICAL SYSTEM

One 12-volt battery only, must be securely mounted and shielded. All vehicles must have the capability of starting without being pushed or pulled. All cars must join lineup on demand, unaided, or go to rear of that race.

One 12-volt non-adjustable ignition box and coil allowed – must be out of driver’s reach, and in a LOCATION THAT TECH CAN GET TO. No additional ignition accessories allowed. The only change that can be made with ignition box is rev-limiter setting, and only one high-end setting is allowed. This setting can be changed through one chip, or an internal setting inside the box.

No electronic or mechanical traction control devices allowed.

Kill switch required within easy reach of driver clearly marked ‘OFF’ and ‘ON’, in a location that the driver and safety crew can get to it from both sides of the car.

FUEL SYSTEM

Racing fuel cells required and must be mounted by at least two solid steel straps, two inches wide around cell.

Fuel cells must be enclosed in steel container and must be mounted securely behind rear axle and between the rear tires, no lower than 9 1/2 inches off the ground, protected by roll-cage tubing.

Protective tubing must cover the rear and extend past both sides of fuel cell. Fuel cells must be protected from bumper down to bottom of cell.

Fuel cell must be a minimum of four inches ahead of rear bumper and no part of fuel cell shall be lower than protective tubing.

Fuel cell vents, including cap vent, must have check valves, and bladders are highly recommended.

Fuel cells are limited to 32-gallon maximum capacity.

Pick-up must not be underneath fuel cell.

A limit of one standard fuel filter allowed between the fuel cell and carburetor.

CARBURETOR

One carburetor allowed; must be naturally aspirated.

FAST EZ-EFI System for Lucas Oil Modified Series

One FIRA FAST EZ-EFI System may be used. Any engine with carburetor and electric fuel pump MUST have in place a 10-15 lb. oil pressure shut off switch properly wired for the electric fuel pump. FIRA FAST EZ-EFI Systems are internally wired with fuel pump safety shut off.

FIRA FAST EZ-EFI System at this time must be purchased from Arce Engines as a complete unit. System will include throttle body, ECM, electrical harness and electric fuel pump.

FIRA FAST EZ-EFI ECM must be mounted in a location that allows easy access for inspection or exchange.

At anytime you may be asked to exchange your FAST EZ-EFI ECM.

At NO time shall the FAST EZ-EFI wiring harness be altered or changed in any way, shape or form.

All FAST EZ-EFI ECM’s must have the FIRA tamper proof seal in place at all times.

FUEL

Pump gas, race fuel, alcohol, or AvGas permitted.

Fuel cells must be protected from bumper down to bottom of cell.

NO Nitrous Oxide. No performance-enhancing fuel additives of any kind

CHASSIS AND ROLL CAGES

Must consist of continuous hoops not less than 1.666-inch outside diameter with a wall thickness of at least 0.095-inch. Low carbon, mild steel tubing is recommended.

Seats, must be frame-mounted in at least six places.

Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops. Driver’s head must not protrude outside cage with helmet on and strapped in driver’s seat. Must have minimum of one cross bar in top halo of roll cage. Roll cage must be securely supported and braced.

Protection of feet is mandatory. Bar across back of engine with vertical bars and rub rails, or similar protection. No brace bars forward of cage may be higher than stock hood height. Main cage no further forward than engine plate.

A minimum of three driver side door bars, at least 1.5-inch O.D., must be as parallel with the ground as possible and located perpendicular to the driver so as to provide maximum protection for driver, but without causing undue difficulty in getting into or out of vehicle.

The side bars must be welded to the front and rear of the roll cage members. Must have at least one cross door bar, minimum 1.25-inch O.D., on passenger side of car, either horizontal or angled.

Steel door plates, 18 gauge or 0.049-inch minimum thickness metal, must be securely welded to outside of door bars on driver’s side. Plate must cover the area from the top door bar to the bottom door bar and from the rear down post to five inches in front of the seat. Must be visible for inspection.

SEATS AND SAFETY EQUIPMENT

It is required that at all times, the driver wear a driving suit and gloves of fire resistant material that effectively covers the entire body, must meet S.F.I. 3-2A/1 requirements. It is also recommended that each driver wear fire proof underwear, fire resistant shoes and a fire resistant head sock.

Helmets are required and must be Snell – SA2010. Helmet must be worn at all times car is on the track and must accompany vehicle at time of inspection.

Neck restraints MANDATORY. Neck restraints such as a Hans Device is recommended. Some type of neck restraint is mandatory.

Five point safety belts, sub belt, shoulder harness required. The shoulder harness must be mounted securely to the roll cage. Belts and harness recommended not to be more than one year old, and cannot be over 3 years old.

Aluminum high-back seats only, must be bolted in and mounted inside the frame rail and ahead of the rear tire. Bottom of seat can be no lower than the bottom of the frame rail. Bolted in 6 locations.

Kill switch required within easy reach of driver clearly marked ‘OFF’ and ‘ON’, in a location that the driver and safety crew can get to it from both sides of the car.

360-degree drive shaft loop required and must be constructed of at least eighth-inch by two-inch steel or one-inch tubing, mounted six inches back from front U-joint. Steel drive shafts (minimum two-inch diameter) and yokes only. Drive shaft must be painted white.

Current test date (2 pound minimum) fire extinguisher to be installed in the car within drivers reach while strapped in. Steel mounts only, no plastic.

All cars will be required to have in their pits a minimum of one 5 pound, Halon or dry chemical fire extinguisher. This is to be visible to tech officials and all crewmembers. All crew members must be made aware of its location, and knowledgeable in the use of the fire extinguisher.

BUMPERS

Center of bumper, front and rear, must be 18 inches, plus or minus two inches, from ground.

Steel bumpers must be used both front and rear at all times and securely mounted with minimum 0.375-inch bolts. Must be made of minimum 1.25-inch OD tubing, 0.065 wall thickness on front – 0.095 wall thickness on rear, and must be able to support car if lifted by wrecker. Two- bar front bumpers must be mounted frame end-to-frame end, no wider than the width of material outside frame horns, with the bottom loop parallel to the ground. Top bar must be directly above bottom bar, minimum 6.5 inches apart, measured center to center at front of bumper (see P in body diagram), so bumper is perpendicular to ground.

Rear bumper, steel nerf bars and bodies must not extend beyond width of tires, and must not contain any sharp edges. Rear bumper no more than two inches wider than body on each side. Fuel cells must be protected from bumper down to bottom of cell.

Rear bumper must resemble one of three configurations, see diagram on page four.

Nerf Bars: All cars must be equipped with approved side rail bars and scrub rails constructed of .083 inch minimum magnetic steel seamless tubing with an outside minimum diameter of 1 inch. Must be full length from front to rear with minimum tire clearance. Side rail bars must be centerlined with the front and rear axles. Only two (2) intermediate supports per bar will be permitted. Side rail bars and scrub rails must be fastened to the frame. Side rail bars and scrub rails must not extend past outside edge of the rear tires and taper slightly toward the front tires. Rear quarter panel side rail bars, right side will be no wider than four (4) inches to the outside of the side rail. Both sides will be no wider than the outside of the left rear tire.

WEIGHTS

Minimum weight limit of 2,500 pounds, before the race with driver in the car. NO TOLERANCE.

Loose objects and/or weights must not be used in driver’s compartment or outside of the body or hood area. Any weights added to other areas of vehicles must be securely mounted with at least two half-inch bolts, painted white and have the car number on it.

Stock appearing front windshield and rear window support unit, painted roll bars not acceptable substitute. May utilize a full-windshield, with no wings, mounted to the roll cage. Must have a minimum of three windshield bars in front of driver. Cowl panel in front of driver can be no wider than cockpit and no farther back than the steering wheel.

Driver and passenger side windows must have at least 12-inch opening, measured at center of window, between the lowest point at the top of window, whether the roof or roll cage, and the highest point at the bottom of window, whether the interior or body.

Window net to be mounted so latch is at top front of window.

APPEARANCE AND IDENTIFICATION

All cars must be numbered with large legible numbers on both sides, on top and rear panel. Numbers on sides and top of car must be in contrasting color from body, be at least four inches thick and at least 20 inches high. Recommended that no holographic or reflective numbers be used.

Sponsors’ names must not interfere with car numbers and must be neatly lettered.

COMMUNICATION

The use of a two-way radio for communication with a spotter and/or pit crew member is recommended.

ELECTRONICS

Radio mandatory. Race receivers (some type of tower to driver will be used).